.box{
    height: calc(100vh - 120px);
    background-color: #fff;
    overflow-y: hidden;
    border-top: 1px solid rgba(0, 21, 41, .08);
    .step{
        padding-top: 64px;
        margin: 0 auto;
        width: 1000px;
    }
    .form{
        margin-top: 64px;
        display: flex;
        width: 800px;
        margin-left: calc(50% - 400px);
    }
}